Chair seat and backrest



FIG. 1 is a top perspective view of the chair seat and backrest;

FIG. 2 is a bottom perspective view of the chair seat and backrest;

FIG. 3 is a right side elevation view of the chair seat and backrest;

FIG. 4 is a left side elevation view of the chair seat and backrest;

FIG. 5 is a front elevation view of the chair seat and backrest;

FIG. 6 is a rear elevation view of the chair seat and backrest;

FIG. 7 is a top plan view of the chair seat and backrest; and,

FIG. 8 is a bottom plan view of the chair seat and backrest.

The broken lines shown in the figures are included for the purpose of illustrating environment only and form no part of the claimed design. 

CLAIM The ornamental design for a chair seat and backrest, as shown and described. 